7871572387 has 8 divisors (see below), whose sum is σ = 9002645856. Its totient is φ = 6742139712.

The previous prime is 7871572369. The next prime is 7871572393. The reversal of 7871572387 is 7832751787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7871572387 - 2²⁷ = 7737354659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7871572307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399898 + ... + 419119.

It is an arithmetic number, because the mean of its divisors is an integer number (1125330732).

Almost surely, 2^7871572387 is an apocalyptic number.

7871572387 is a deficient number, since it is larger than the sum of its proper divisors (1131073469).

7871572387 is a wasteful number, since it uses less digits than its factorization.

7871572387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820397.

The product of its digits is 4609920, while the sum is 55.

The square root of 7871572387 is about 88721.8822331898. The cubic root of 7871572387 is about 1989.2399129969.

The spelling of 7871572387 in words is "seven billion, eight hundred seventy-one million, five hundred seventy-two thousand, three hundred eighty-seven".